آمار
| تعداد نشریات | 36 |
| تعداد شماره‌ها | 1,192 |
| تعداد مقالات | 8,579 |
| تعداد مشاهده مقاله | 6,988,711 |
| تعداد دریافت فایل اصل مقاله | 4,032,562 |
یک روش جدید برای نهان‌نگاری تصاویر به کمک تبدیلات موجک | ||
| پدافند الکترونیکی و سایبری | ||
| مقاله 8، دوره 7، شماره 3 - شماره پیاپی 23، آبان 1398، صفحه 83-91 اصل مقاله (1.06 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| محسن شاهرضایی* 1؛ نوید رزمجوی2 | ||
| 1دانشگاه امام حسین(ع) | ||
| 2کارشناسی ارشد دانشگاه امام حسین | ||
| تاریخ دریافت: 10 آذر 1397، تاریخ بازنگری: 02 بهمن 1397، تاریخ پذیرش: 14 اسفند 1397 | ||
| چکیده | ||
| در عصر حاضر، به موازات گسترش فناوری در زمینههای مختلف و امکان شدن انجام کارهای مختلف از راه دور و با استفاده از شبکه‌های داخلی و اینترنت، مشکلاتی نیز کنار این فناوریها بهوجود آمده است. از جمله این مشکلات میتوان به حفظ امنیت اطلاعات در زمان ارسال و دریافت برای جلوگیری از دسترسیهای غیرمجاز اشاره کرد. پنهاننگاری، علم پنهانسازی و پوشاندن اطلاعات مورد نظر با بیشترین میزان دقت به امنیت، جهت انتقال امن اطلاعات بین نقاط موردنظر است، به طوری که حتی در صورت دستیابی افراد غیرمجاز به اطلاعات، امکان دستیابی به داده‌های پنهان وجود نخواهد داشت. در پنهاننگاری دو ویژگی مهم وجود دارد. اول اینکه تعبیه اطلاعات نباید تغییرات قابل توجهی در محیط میزبان ایجاد کند و دوم اینکه خواص آماری پوشانه و پیام تا حد امکان به هم نزدیک باشند تا عمل پنهاننگاری بهتر انجام گیرند. هدف اصلی در این مقاله ارائه یک روش جدید بر اساس تبدیلات موجک برای رسیدن به یک روش پنهاننگاری مناسب است. در این روش، بر اساس تبدیلات موجک، تصاویر رنگی موردنظر برای پنهاننگاری در تصاویر دیگری نهان‌نگاری میشوند که بهصورت عادی قابل مشاهده نیستند و برای مشاهده آن به کلید آن نیاز خواهد بود. نتایج شبیهسازی نشاندهنده کارایی بالای روش پیشنهادی است. | ||
| کلیدواژه‌ها | ||
| احراز هویت؛ نهان‌نگاری؛ تصویر دیجیتال؛ تبدیل موجک؛ روش تجزیه مقدار تکین | ||
| عنوان مقاله [English] | ||
| A New Method for Image Steganography Using Discrete Wavelet Transforms | ||
| نویسندگان [English] | ||
| M. Shahrezaei1؛ N. Razmjoei2 | ||
| 2- | ||
| چکیده [English] | ||
| In the present era, along with the spread of technology in different fields and the possibility of remotely accomplishing different tasks and using internal networks and the Internet, related problems and challenges have occurred. One of these problems is maintaining the security of information while sending and receiving, to prevent unauthorized access. Watermarking is the science of hiding and covering the information with the highest degree of accuracy in security, in order to securely transfer information between the points of interest, so that even when an unauthorized access happens, there is no access to the watermarked data. There are two important features in watermarking. First, the information embedding should not make significant changes in the host environment, and second, the statistical properties of the cover image and the message should be as close as possible in order to have better cryptography. The main purpose of this paper is to provide a new method based on discrete wavelet transform to achieve a suitable cryptographic method. In this method, based on wavelet transforms, color images are watermarked so that they are not normally visible and their key is needed to view them. Simulation results indicate the efficiency of the proposed method. | ||
| کلیدواژه‌ها [English] | ||
| Authentication, cryptography, digital image, wavelet transform, singular value decomposition | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 373 تعداد دریافت فایل اصل مقاله: 275 |
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